CN108550447B - Obliquely-arranged special-shaped composite insulator - Google Patents

Abstract

The invention discloses a special-shaped composite insulator which is obliquely arranged, comprising two groups of core rods which are obliquely arranged and a plurality of umbrella skirt structures which are fixed on the core rods; the upper ends of the two groups of core rods are respectively connected to two different positions of the cross arm, and the lower ends of the core rods are connected with the same wire clamp fitting; the umbrella skirt structures are all plane umbrella skirt structures and are distributed in parallel, and the umbrella skirt planes of the umbrella skirt structures are vertically arranged on the core rod in an inclined state. According to the invention, the purpose of less icing and dirt accumulation is achieved by changing the appearance structure of the insulator, the transmission line is pulled by using two groups of core rods which are obliquely arranged, the umbrella skirt insulator fixed on the core rods can be arranged vertically by using the core rods in an oblique state, so that the umbrella skirt structure of the insulator is vertical to the horizontal plane, the exposure area of the umbrella skirt structure in the vertical direction is greatly reduced, the collision area of the umbrella skirt structure with rain and snow and the dirt accumulation and the ice accumulation are reduced, and the special-shaped insulator adopts a reinforced design, so that the service life of the insulator is prolonged.

Description

Special-shaped composite insulators arranged obliquely

Technical field

The invention belongs to the technical field of electric power engineering and relates to insulators for transmission lines, specifically a special-shaped composite insulator arranged at an angle.

Background technique

Composite insulators are widely used in overhead transmission lines due to their advantages of good pollution resistance, light weight, and high mechanical strength. The excellent electrical performance of composite insulators is due to the fact that its shed structure and core rod sheath are both made of high-temperature vulcanized silicone rubber. On the one hand, the silicone rubber material has super hydrophobic properties; on the other hand, the silicone rubber material has good hydrophobicity. Water migration characteristics, application shows that composite insulators can effectively prevent the occurrence of pollution flashover. Although composite insulators have so many advantages, when encountering rain, snow and freezing weather, the sloped shed structure of the composite insulator has a large exposed area in the vertical direction, causing ice to grow on the surface of the shed, and the ice layer reaches After a certain thickness, the shed can easily sag due to the gravity of the ice coating, causing the upper and lower sheds to be bridged by ice edges. After the entire insulator is bridged by ice edges, the flashover voltage of the insulator is greatly reduced, making ice flash easily possible. , endangering the safety of the power grid; on the other hand, the shed of ordinary composite insulators is thin, and the ice layer causes the lower part of the shed to deform. After repeated ice coating, the shed may be permanently deformed, affecting its service life. Existing technical measures are to promptly replace them after ice flash or deformation occurs. However, the above-mentioned inspections not only require a heavy workload, but also require high-altitude operations, which is highly dangerous.

Contents of the invention

The technical problem solved by the present invention is to provide a special-shaped composite insulator with an oblique arrangement in order to solve the defects of the existing composite insulator structure, which is prone to ice flash due to ice coating and has a short service life in extreme weather.

The present invention adopts the following technical solutions to achieve:

The obliquely arranged special-shaped composite insulator includes two sets of obliquely arranged core rods 4 and several shed structures fixed on the core rods;

The upper ends of the two sets of mandrels 4 are respectively connected to two different positions of the cross arm 6, and the lower ends of the mandrels 4 are connected to the same wire clamp fitting 7;

The shed structures are all planar shed structures, which are distributed parallel to each other, and the shed planes are arranged vertically on the mandrel 4 in an inclined state.

Furthermore, the angle between the plane where the shed structure is located and the core rod 4 and the inclination angle of the core rod 4 relative to the horizontal plane are complementary angles to each other.

Furthermore, the centers of the shed structures are located on the axis of the core rod 4 , and the thickness of the shed structure at the upper half of the core rod 4 is greater than the thickness of the lower half of the core rod 4 .

Furthermore, the thickness of the shed structure is the largest relative to the top of the core rod, and the thickness of the shed structure is the smallest relative to the bottom of the core rod, and the thickness from the top to the bottom of the shed structure is gradually connected.

Further, the edge of the shed structure is set into a streamlined arc edge.

In the obliquely arranged special-shaped composite insulator of the present invention, the shed structure includes at least two groups of disc sheds with different area sizes, and the disc sheds with different area sizes are fixed on the core rod 4 in an alternating manner.

Further, the shed structure is a disk structure with a thickness of 1 to 10 mm and a radius of 4 to 10 times the radius of the core rod.

Furthermore, the shed structure is made of vulcanized silicone rubber through one-piece injection molding. It is provided with a through hole for the core rod to pass through, and is fitted on the core rod 4 through the through hole by interference fit or adhesive bonding.

Furthermore, the core rod 4 is a glass core rod, which is covered with an insulating sheath.

Furthermore, the two ends of the mandrel 4 are respectively fixed with a ball socket fitting 1 connected to the cross arm 6 and a ball head fitting 5 connected to the wire clamp fitting 7 .

This invention achieves the purpose of reducing ice coating and dirt accumulation by changing the shape and structure of the insulator. It uses two sets of mandrels arranged at an angle to pull the transmission line. The mandrels in the inclined state can be used to fix the shed insulator on the mandrels. Set it vertically, so that the shed structure of the insulator is perpendicular to the horizontal plane, and the thickest and thinnest parts of the shed structure, which is thick at the top and thin at the bottom, are in the same vertical plane, which greatly reduces the vertical deflection of the shed structure. On the one hand, the exposed area in the direction of the umbrella skirt reduces the collision area with rain and snow. On the other hand, the entire umbrella surface of the umbrella skirt structure is arranged almost vertically, so that dirt particles, rain and snow, etc. are not easily trapped in the umbrella skirt structure under the action of its own gravity. The umbrella surface remains, reducing dirt and ice accumulation.

In addition, the insulator of the present invention adopts a special-shaped structure that is thick at the top and thin at the bottom. The upper shed that is directly exposed to the impact of rain and snow adopts a reinforced design. Even if it is covered with ice, the shed is not easy to droop and will not cause deformation of the insulator and affect its performance. At the same time, the umbrella The edge of the skirt adopts a streamlined structure, which is beneficial to reducing the overall wind resistance of the insulator.

From the above, the present invention uses the above-mentioned obliquely arranged special-shaped composite insulators, which can effectively reduce the amount of ice coating and dirt accumulation on the surface of the insulator, greatly reduce the probability of ice flash and pollution flash, and at the same time greatly reduce the deformation of the composite insulator shed caused by ice coating. , improve the service life of insulators and reduce the high-altitude operations of repairing and replacing insulators.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Figure 1 is a schematic diagram of the installation state of the obliquely arranged special-shaped composite insulator in the embodiment.

Figure 2 is a schematic structural diagram of a single composite insulator in the embodiment.

Figure 3a is a schematic plan view of the umbrella skirt structure in the embodiment.

Figure 3b is a schematic cross-sectional view of the umbrella skirt structure in the embodiment.

Numbers in the picture:

1—ball and socket hardware;

2—The first umbrella skirt,

21—First put on the umbrella skirt,

22—The first umbrella skirt;

3—Second umbrella skirt,

31—The second upper umbrella skirt,

32—Second umbrella skirt;

4—mandrel;

5—ball head hardware;

6—cross arm;

7—Wire clamp hardware.

Detailed ways

Example

Referring to Figure 1, the special-shaped composite insulator arranged obliquely in the figure is the preferred solution of the present invention, and specifically includes a ball socket fitting 1, a core rod 4, a ball head fitting 5 and several sets of first sheds 2 fixed on the core rod 4. and second umbrella skirt 3. Among them, there are two sets of core rods 4. The ball socket fitting 1 and the ball head fitting 5 are respectively fixed at both ends of the core rod 4. The two sets of core rods 4 with the ball socket fitting 1 have one end facing upward and are respectively fixed and hung on the transmission line. At two positions on the cross arm 6 of the tower, two sets of mandrels 4 with ball-head fittings 5 are provided with one end facing downwards and moving closer to the middle, and are connected to the same line clamp fitting 7, so as to realize the control of the transmission line through the line clamp fitting 7. layout. The core rod of the insulator in this installation state is different from the existing vertical state. The two sets of core rods 4 are arranged at an angle relative to the horizontal plane, which facilitates the installation of several groups of special-shaped shed structures fixed on the core rods 4. into vertical position.

The ball socket fittings 1 and ball head fittings 5 of this embodiment adopt commercially available conventional composite insulators to match the ball head fittings and ball socket fittings. The core rod 4 uses a glass core rod. In order to protect the glass core rod, the core rod 4 is wrapped with Insulating sheath. The insulating sheath wrapped around the mandrel is made of high-temperature vulcanized silicone rubber. A certain length is left unwrapped at both ends of the mandrel for crimping hardware. The first shed 2 and the second shed 3 are set through the set. Bonded or injected through a mold on the sheathed mandrel 4, the ball socket fitting 1 is connected to the upper end of the unsheathed mandrel 4, and the ball head fitting 5 is connected to the lower end of the unsheathed mandrel 4. .

Referring to Figure 2 and Figures 3a and 3b, the shed structure in this embodiment is a planar shed structure, which is divided into two groups of first sheds 2 and second sheds 3 with different area sizes. The first shed 2 and the second umbrella skirt 3 are arranged alternately. The first shed 2 and the second shed 3 are disk-shaped as a whole, wherein the area size of the first shed 2 is larger than the area size of the second shed 3, and the centers of the first shed 2 and the second shed 3 The plane where the cross section is located is inclined relative to the axis of the core rod 4, all sheds are tilted in the same direction, and all sheds are parallel to each other.

The angle between the central cross-section of the first shed 2 and the second shed 3 and the axis of the core rod 4 is a supplementary angle to the inclination angle of the core rod 4 relative to the horizontal plane in the installation state in Figure 1, so that Ensure that after the composite insulator is installed in the state shown in Figure 1, all shed structures are in a vertical state relative to the horizontal plane on the tilted core rod 4.

As shown in Figures 3a and 3b, the thickness of the first upper shed 21 in the upper half of the first shed 2 is greater than the thickness of the first lower shed 22 in the lower half of the first shed 2, and along the Viewed from the upper and lower longitudinal sections of the skirt structure, the longitudinal section of the shed structure is in a streamlined shuttle shape, in which the thickness at the top of the first upper shed 21 is the largest, and the thickness at the bottom of the first lower shed 22 is the smallest, and there is a shape between the two. The thickness gradient transition connection, through this special-shaped shed structure that is thick at the top and thin at the bottom, combined with the overall vertical arrangement of the shed structure, improves the pressure-bearing strength of the shed structure of the insulator, and the shed structure is less prone to deformation such as sagging. Moreover, a streamlined arc edge is provided on the entire circular edge of the shed structure to reduce the wind resistance of the shed when it is erected on the transmission tower.

The upper half and the lower half referred to in this embodiment refer to the plane where the axis of the core rod 4 is located in Figure 2 as the boundary. The first upper shed 21 is located in the upper half of the plane, and the first upper shed 21 is located in the lower half of the plane. The bottom part is the first lower umbrella skirt 22.

Similarly, the thickness of the second upper shed 31 in the upper half of the second shed 3 is greater than the thickness of the second lower shed 32 in the lower half of the second shed 3, and the overall thickness distribution is the same as that of the first shed.

The first shed 2 and the second shed 3 are both disc structures. There is a through hole in the center of the shed structure for socketing with the mandrel 4. The through holes of all shed structures are coaxial. Due to the shed structure The through hole is coaxial with the core rod 4, so it is arranged at an angle relative to the axis of the overall shed structure. The overall shed structure is an insulator and is made of vulcanized silicone rubber through integral injection molding. The through holes on it are used to interfere with the sleeve or glue. The connector is installed on the mandrel 4. In the molding process of making the shed structure, the shed structure can be injection molded separately first, and then fixed with the mandrel. Alternatively, the shed structure can be fixed to the mandrel 4 simultaneously by injection molding. The specific method is as follows: place the glass core rod in the pre-made shed injection mold, inject high-temperature vulcanized silicone rubber into the mold to complete the one-time molding of the special-shaped composite insulator, and the formed shed structure is fastened to the glass core rod.

In practical application of this embodiment, the inclination angle, quantity and combined area size of the shed structure can be adjusted according to actual engineering needs, but it must include at least two shed structures with different area sizes in this embodiment.

The above-mentioned special-shaped composite insulator for inclined arrangement has been trial-produced and proved to be effective, safe and reliable, and fully meets the design requirements.

The above is a clear and complete description of the technical solutions in the embodiments with reference to the accompanying drawings of the embodiments. Obviously, the described embodiment is only one of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims (9)

1. The obliquely arranged special-shaped composite insulator is characterized by: including two sets of obliquely arranged core rods (4) and several shed structures fixed on the core rods; The upper ends of the two sets of core rods (4) are connected to two different positions of the cross arm (6) respectively, and the lower ends of the core rods (4) are connected to the same wire clamp fitting (7); The shed structures are all flat shed structures, distributed parallel to each other, and the shed planes are arranged vertically on the inclined mandrel (4); Viewed along the upper and lower longitudinal sections of the shed structure, the longitudinal section of the shed structure is streamlined and fusiform; The centers of the shed structures are all located on the axis of the core rod (4), and the thickness of the upper half of the shed structure at the core rod (4) is greater than the thickness of the lower half of the core rod (4). 2. The obliquely arranged special-shaped composite insulator according to claim 1, the angle between the plane where the shed structure is located and the core rod (4) and the inclination angle of the core rod (4) relative to the horizontal plane are complementary angles to each other. . 3. The obliquely arranged special-shaped composite insulator according to claim 1, the thickness of the shed structure relative to the top of the core rod is the largest, the thickness of the shed structure relative to the bottom of the core rod is the smallest, and the thickness of the shed structure is the smallest. Thickness gradient transition connection from top to bottom. 4. The obliquely arranged special-shaped composite insulator according to claim 3, wherein the edge of the shed structure is configured as a streamlined arc edge. 5. The obliquely arranged special-shaped composite insulator according to any one of claims 1 to 4, the shed structure includes at least two groups of disc sheds with different area sizes, between the disc sheds with different area sizes Staggered fixation on the mandrel (4). 6. The obliquely arranged special-shaped composite insulator according to claim 5, wherein the shed structure is a disc structure with a thickness of 100 and a radius. 7. The obliquely arranged special-shaped composite insulator according to claim 6, the shed structure is made of vulcanized silicone rubber through one-piece injection molding, and is provided with a through hole for the core rod to pass through, and the through hole interferes with the insulator. Set or glue the set on the mandrel (4). 8. The obliquely arranged special-shaped composite insulator according to claim 1 or 6, wherein the core rod (4) is a glass core rod and is covered with an insulating sheath. 9. The obliquely arranged special-shaped composite insulator according to claim 8, the two ends of the core rod (4) are respectively fixed with a ball socket fitting (1) and a connecting wire clamp fitting (7) connecting the cross arm (6). Ball head fittings (5).